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LT3501 - Monolithic Dual Tracking 3A Step-Down Switching Regulator

Features

  • Wide Input Range: 3.1V to 25V
  • Two Switching Regulators with 3A Output Capability
  • Independent Supply to Each Regulator
  • Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 1.5MHz
  • Antiphase Switching
  • Outputs Can be Paralleled
  • Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs
  • Independent Soft-Start and Power Good Pins
  • Enhanced Short-Circuit Protection
  • Low Dropout: 95% Maximum Duty Cycle
  • Low Shutdown Current: <10µA
  • 20-Lead TSSOP Package with Exposed Leadframe

Typical Application

LT3501 Typical Application
LT3501 Typical Application

Description

The LT3501 is a dual current mode PWM step-down DC/DC converter with two internal 3.5A switches. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking/sequencing requirements.

Both converters are synchronized to either a common external clock input or a resistor programmable fi xed 250kHz to 1.5MHz internal oscillator. At all frequencies, a 180° phase relationship between channels is maintained, reducing voltage ripple and component size. Programmable frequency allows for optimization between effi ciency and external component size.

Minimum input-to-output voltage ratios are improved by allowing the switch to stay on through multiple clock cycles, only switching off when the boost capacitor needs recharging, resulting in ~95% maximum duty cycle.

Each output can be independently disabled using its own soft-start pin, or by using the SHDN pin the entire part can be placed in a low quiescent current shutdown mode.

The LT3501 is available in a 20-lead TSSOP package with exposed leadframe for low thermal resistance.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

TSSOP-20

LT3501 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3501EFE TSSOP 20 E $5.41 $3.50 View
LT3501EFE#PBF TSSOP 20 E $5.41 $3.50 View
LT3501EFE#TR TSSOP 20 E $3.55 View
LT3501EFE#TRPBF TSSOP 20 E $3.55 View
LT3501IFE TSSOP 20 I $6.48 $4.20 View
LT3501IFE#PBF TSSOP 20 I $6.48 $4.20 View
LT3501IFE#TR TSSOP 20 I $4.25 View
LT3501IFE#TRPBF TSSOP 20 I $4.25 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC964A LT3501EFE Demo Board- Dual Monolithic Step-Down Switching Reg $225.00
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Click here to view our complete list of demo boards

Applications

  • DSP Power Supplies
  • Disc Drives
  • DSL/Cable Modems
  • Wall Transformer Regulation
  • Distributed Power Regulation

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LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

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Related models available in LTspice IV
LT3501

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